Can you prototype any kind of product? Less user-oriented products (e.g. APIs) are harder to prototype, and you probably can’t test every aspect of it, but there must be something you can still test with a prototype.

All the questions and discussion about what prototyping tools is the best reminds me of a similar question among photographers. They focus so much on the right camera/lens that they forget about what’s really important. Don’t go crazy about the tools, tools are secondary, mindset and methodology – primary. Keep this in mind.

Prototyping for physical products is not that different from digital products. The cost may be a little higher due to the need of buying materials or even getting access to a 3D printer, but same process and mindset.